The engineering equipment of the building mainly includes water chiller, water pump, cooling tower, heat exchanger, fresh air unit, air conditioning unit, exhaust fan, smoke exhaust fan, booster fan, fan coil unit, VAV variable air volume terminal device, fire hydrant and hydrant box, water tank, booster tank, generator set, high and low voltage switchgear, transformer, control box, power box and other types of equipment, totaling 21